This is a randomized, parallel-group study designed to explore the differences between cannabis intoxication, alcohol intoxication and co-intoxication involving both alcohol and cannabis, utilizing electroencephalography (EEG) as well as more traditional intoxication measures such as breath alcohol concentration and balance metrics. If eligible for the study, participants will be randomized to complete one study session in our mobile laboratory, during which they will use either alcohol, cannabis (which will be self-administered, ad libitum) or both alcohol and cannabis.
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Electroencephalography (EEG) Objective Cognitive Function Measures--Amplitude (microvolts)
Timeframe: Immediately pre-substance use, 1-hour post-use, 2-hours post-use, 4-hours post-use
Electroencephalography (EEG) Objective Cognitive Function Measures--Latency (milliseconds)
Timeframe: Immediately pre-substance use, 1-hour post-use, 2-hours post-use, 4-hours post-use
Standing postural stability
Timeframe: Immediately pre-substance use, 1-hour post-use, 2-hours post-use, 4-hours post-use